Problem with database failed to connect to cloudsql

[Mutasim Issa]

Hello,

I'm trying to deploy a wordpress site on app engine and cloud SQL, I tried first and second generation cloud sql with same result; when I try to access the site on .appspot.com it shows Database error, I authorised access to the cloudsql instance by typing app ID only, what could be the problem?
Thanks

[George (Cloud Platform Support)]

Hello Mutasim, 

Access control occurs on two levels: Instance-level access and Database access. The app ID does not award you access to the database instance. You can find more information and easy steps to follow on the "Instance Access Control" documentation page. 

If you need to connect from external application, you can follow the advice on the "Connecting to Cloud SQL from External Applications" page. 

We are here to gladly reply to eventual extra questions. 

[Mutasim Issa]

I don't think this was the problem, the SQL instance and the appengine were in the same project, however I think something was wrong in Wordpress config files, I reinstalled the endpoint and it succeed at the end.